Tool-measuring apparatus for measuring a tool in a tool holder, and a tool holder

Abstract

A tool-measuring device that measures a tool in a tool holder and that includes a measuring device and a processing device. The processing device controls the measuring device. The tool-measuring device measures a measuring point of the tool holder at a location relative to an apparatus point. In order to counter an error during the measurement of the tool, which error may be caused by a thermal change in size of the tool or of the tool holder or by an operator error, the processing device controls a measurement of a measuring point of the tool holder at another location and a position of a holder point of the tool holder relative to the apparatus point by the two measurements.

1 . A tool-measuring apparatus for measuring a tool in a tool holder, comprising a measuring means and a processing means for controlling the measuring means for measuring a measuring point of the tool holder at a location relative to an apparatus point, wherein the processing means is provided for controlling a measurement of a measuring point of the tool holder at another location and for determining a position of a holder point of the tool holder relative to the apparatus point by means of the two measurements. 
   
   
       2 . The tool-measuring apparatus as claimed in  claim 1 , which comprises a means of movement for moving the measuring point between the two measurements from the first location to the second location. 
   
   
       3 . The tool-measuring apparatus as claimed in  claim 1 , wherein the two measuring points are arranged opposite one another relative to an axis of symmetry of the tool holder. 
   
   
       4 . The tool-measuring apparatus as claimed in  claim 2 , wherein the two measuring points are arranged opposite one another relative to an axis of symmetry of the tool holder. 
   
   
       5 . The tool-measuring apparatus as claimed in  claim 1 , wherein the processing means is prepared for using the position of the holder point as a reference point for a tool measurement. 
   
   
       6 . The tool-measuring apparatus as claimed in  claim 2 , wherein the processing means is prepared for using the position of the holder point as a reference point for a tool measurement. 
   
   
       7 . The tool-measuring apparatus as claimed in  claim 1 , wherein the processing means is provided for determining a center position between the locations. 
   
   
       8 . The tool-measuring apparatus as claimed in  claim 2 , wherein the processing means is provided for determining a center position between the locations. 
   
   
       9 . The tool-measuring apparatus as claimed in  claim 1 , wherein the processing means is provided for determining the position of the holder point from a center position between the locations and a predetermined transverse distance transversely to a connecting line between the locations. 
   
   
       10 . The tool-measuring apparatus as claimed in  claim 2 , wherein the processing means is provided for determining the position of the holder point from a center position between the locations and a predetermined transverse distance transversely to a connecting line between the locations. 
   
   
       11 . The tool-measuring apparatus as claimed in  claim 1 , wherein the processing means is provided for determining a correction of the position of the holder point from a distance between the locations. 
   
   
       12 . The tool-measuring apparatus as claimed in  claim 2 , wherein the processing means is provided for determining a correction of the position of the holder point from a distance between the locations. 
   
   
       13 . The tool-measuring apparatus as claimed in  claim 1 , wherein the processing means is provided for determining an error distance between the holder point and an instantaneous rotation axis from measurements of the measuring points. 
   
   
       14 . The tool-measuring apparatus as claimed in  claim 2 , wherein the processing means is provided for determining an error distance between the holder point and an instantaneous rotation axis from measurements of the measuring points. 
   
   
       15 . The tool-measuring apparatus as claimed in  claim 1 , wherein the processing means is provided for determining an error angle between an axis of symmetry of the tool holder and an instantaneous rotation axis from measurements of the measuring points. 
   
   
       16 . The tool-measuring apparatus as claimed in  claim 1 , wherein the processing means is provided for determining an error angle between an axis of symmetry of the tool holder and an instantaneous rotation axis from measurements of the measuring points. 
   
   
       17 . A tool holder for clamping a tool in place, having a measuring element designed for a measurement and an axis of symmetry, which comprises a further measuring element designed for a measurement, the two measuring elements being opposite one another with respect to the axis of symmetry. 
   
   
       18 . The tool holder as claimed in  claim 17 , wherein both measuring elements each have a measuring means for measuring transversely to the axis of symmetry. 
   
   
       19 . The tool holder as claimed in  claim 17 , wherein at least one of the measuring elements has a measuring means for measuring along and transversely to the axis of symmetry. 
   
   
       20 . The tool holder as claimed in  claim 18 , wherein at least one of the measuring elements has a measuring means for measuring along and transversely to the axis of symmetry.